20558224 has 10 divisors (see below), whose sum is σ = 39831590. Its totient is φ = 10279104.

The previous prime is 20558221. The next prime is 20558233. The reversal of 20558224 is 42285502.

It can be written as a sum of positive squares in only one way, i.e., 10445824 + 10112400 = 3232^2 + 3180^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20558192 and 20558201.

It is not an unprimeable number, because it can be changed into a prime (20558221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642429 + ... + 642460.

It is an arithmetic number, because the mean of its divisors is an integer number (3983159).

Almost surely, 2^20558224 is an apocalyptic number.

It is an amenable number.

20558224 is a deficient number, since it is larger than the sum of its proper divisors (19273366).

20558224 is a wasteful number, since it uses less digits than its factorization.

20558224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284897 (or 1284891 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20558224 is about 4534.1177752679. The cubic root of 20558224 is about 273.9440452632.

The spelling of 20558224 in words is "twenty million, five hundred fifty-eight thousand, two hundred twenty-four".